Is it a rattle or engine knock?
As these cars make so much torque at such low RPM, and with these so called flash tunes (most likely just add boost and raise limits to stop CELs and limp modes) you could be exceeding MBT at those load points.
Not sure if VAG ECUs log and actively display the knock channel but worth a look if you have the interface.
Perhaps try running a tank of BP Ultimate mixed with a bottle of octane booster to suppress knock. At least you can rule that out.
If the tune is rich enough, you could splash in 5L of E85 into your tank of BP Ultimate with octane booster to increase knock resistance - just to rule things out.
As these cars make so much torque at such low RPM, and with these so called flash tunes (most likely just add boost and raise limits to stop CELs and limp modes) you could be exceeding MBT at those load points.
Not sure if VAG ECUs log and actively display the knock channel but worth a look if you have the interface.
Perhaps try running a tank of BP Ultimate mixed with a bottle of octane booster to suppress knock. At least you can rule that out.
If the tune is rich enough, you could splash in 5L of E85 into your tank of BP Ultimate with octane booster to increase knock resistance - just to rule things out.
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